product(size_t, AsyncLogBufferSize, 2*M, \ Users can provide a custom value to trade memory overhead for log accuracy if they need to. The default value should be big enough to cater for most cases. This feature is disabled by default.Ī new product option -XX:AsyncLogBufferSize is added, which specifies the memory budget in bytes for the intermediate buffer. If the user passes -Xlog:async on the command-line, then the JVM uses "Asynchronous Logging" for all logging. On buffer exhaustion the enqueuing message is discarded so that under no circumstances will logging block threads. Log entry write operations are guaranteed non-blocking. In asynchronous logging mode, log sites enqueue all logging messages to a buffer and a standalone thread is responsible for flushing them to the corresponding outputs. If this hang happens often with your workload, I suggest using a newer kernel and/or formatting xfs with a larger log to meet the demands of your workload. Our solution is to provide a new feature "Asynchronous Logging" for the unified logging subsystem. The reported kernel version 5.10.38 has almost no upstream fixes at all, but I don't think that any of the fixes in 5.10.y are relevant for this case anyway.
After I freed up space on the pgxlog partition and restarted, it took some time to replay all of the log (15-20 minutes) and everything recovered with no data corruption However, the theory about the data partition filling up first didn't happen in my case. In the worst case, hotspot may hang at a safepoint. user that the data directory filled up before pgxlog filled up. If the block of log writing occurs when the VM wants to go to a safepoint, or initiate a handshake, then the VM can experience long pauses which then increase the response time of a Java application/service. Writing logs via a socket or other network-backed virtual filesystems could block due to network. For example, writing logs to a filesystem could be blocked by the kernel. Add a global option -Xlog:async to the Hotspot command-line options, which directs unified logs to be written asynchronously.
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